Protect circuit of register

Details Protect circuit of register Protect circuit of register

1998-01-21

2000-02-01

Sheikh, Ayaz R.

Electrical computers and digital processing systems: memory

Storage accessing and control

711143, 711154, 711210, 710 52, 36518901, 36518905, G06F 1200

Patent

active

060214600

ABSTRACT:
A protect circuit of a register which can positively protect the contents of a register in a runaway of a program in a microcomputer or the like. It includes a first register for holding data on a data bus of a microcomputer at a first time instant, a second register for holding the data on the data bus at a second time instant which is later than the first time instant by a predetermined time interval, a timer for counting a time period from the first time instant, the timer overflowing when it counts a predetermined time period longer than the predetermined time interval, and a controller for updating a register to be protected by moving data in the first register into the register to be protected only when the second register holds, before the timer overflows, the same data as that held in the first register.

REFERENCES:
patent: 4881169 (1989-11-01), Tanaka et al.
patent: 5550993 (1996-08-01), Ehlig et al.
patent: 5802579 (1998-09-01), Crary

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